An interesting quandary

[Anthony]

Originally Posted by Tigrah2k

Though, that does still beg the question then... how do you decipher the "source", or identify the "best source" for it under the given intent?

By the power source modifier, if one is present. If no power source is specified, it does not have a power source and cannot be targeted by powers that specify a power source. 'Cosmic' is basically 'rules exemption': the power ignores a rule that normally applies to that power. Note that 'rules exemption: can target powers without a power source' is legitimate.